
Questyle will release the high-end portable DAC/headphone amplifier "SIGMA Pro" on November 28, with pre-orders starting November 21.
Featuring dual ESS ES9069Q DACs and TTA decoding, it achieves 25Vp-p output and supports high-impedance headphones.
Equipped with XMOS XU316 USB interface, it supports PCM 768kHz/32bit, DSD 512, MQA, and various Bluetooth codecs.

The Cayin RU3 is a compact mobile DAC/headphone amplifier, measuring 6 cm in length and 2.5 cm in width, weighing 24 grams.
It features the ESS ES9069Q DAC chip with HyperStream-IV-Dual architecture, supporting PCM up to 768 kHz and DSD512 formats.
Connectivity includes USB-C for UAC1.0 and UAC2.0, alongside 3.5mm and 4.4mm headphone outputs for versatile compatibility.